PDF-Theorem: The base angles of an isosceles trapezoid are equal ntroduct

The purpose in writing. Angles are ACUTE angles Angles equal to 90 are RIGHT angles Angle are OBTUSE angles Angles equal to 180 Angles more than 180 are REFLEX angles Central Angles. Central Angle. (of a circle). Central Angle. (of a circle). NOT A. Central Angle. (of a circle). A . central angle. is an angle whose vertex is the CENTER of the circle. CENTRAL ANGLES AND ARCS. Which is the correct definition of isosceles?. a.) a triangle with at least 2 congruent sides. b.) a triangle with exactly 2 congruent sides. 4.5 Isosceles Triangles. LEQ: How can we use properties of isosceles triangles to construct proofs?. Sec: . 4.5. Sol: G.5. Properties of Isosceles Triangles. An isosceles triangle is a triangle with two congruent sides.. The congruent sides are called legs and the third side is called the base.. 3. What makes a quadrilateral a rhombus?. Rhombuses Or Rhombi. A . rhombus. . is an equilateral parallelogram.. All sides are congruent. Rhombus Corollary. A quadrilateral is a rhombus if and only if it has four congruent sides.. Definitions. Complementary angles – the sum of their measures is 90˚. Each angle is the compliment of the other. A. B. 32˚. 58˚. Definitions. Supplementary angles – the sum of their measures is 180˚. Thursday, October 17. Math Message. Label unit 3.9 and the date at the top of your Math Response. Complete the following in your Math Notebook:. Using a straightedge, draw a big triangle in your notebook. Geometry Unit 4. Angles of A Triangle. Content Objective. : Students will be able to identify the properties and classifications of specific triangles, using them to solve problems.. Language Objective. Sec: 4.6. Sol: G.5. Properties of Isosceles Triangles. An isosceles triangle is a triangle with two congruent sides.. The congruent sides are called legs and the third side is called the base.. 3. Leg. Polygon Interior angle sum. The sum of the interior angle measures of an . n. -sided convex polygon is (n-2) 180. Po. lygon Exterior angle sum. The sum of the exterior angle measures of a convex polygon, one angle at each vertex is 360 degrees. Triangles. Isosceles Triangles. leg. leg. base. Vertex angle. Base angle. Base angle. 2 sides are congruent. 2 theorems. If 2 sides are congruent, then base angles are congruent. If 2 . base angles . Objective. :. To understand and apply properties of isosceles and equilateral triangles.. Supplies. :. Math Notebook. Assignment: 4.8 p. 276: 1-10, 12-16, 22-26. 4.8: Isosceles & Equilateral Triangles. CCSS. Content Standards. G.CO.10 Prove theorems about triangles. . G.CO.12 Make formal geometric constructions with a variety of tools and methods (compass and straightedge, string, reflective devices, paper folding, dynamic geometric software, etc.).. Recall that an isosceles triangle has at least two congruent sides. The congruent sides are called the . legs. . The . vertex angle. is the angle formed by the legs. The side opposite the vertex angle is called the .